Gabriel Joseph Cruz McQueen was the son of Mercedes McQueen and her then-boyfriend Joe Roscoe.
Mercedes discovered that she was pregnant in June 2015, four months after she had a one-night-stand with Joe when she was hiding out in France, faking her death to frame Joe's brother Freddie Roscoe for her 'murder'. Upon learning of Mercedes' pregnancy, Joe promised to support her, but after Joe learned he may never walk again after being attacked with a crowbar by Robbie Roscoe, Joe told Mercedes to get an abortion. After learning of the pregnancy, Freddie urged Joe not to turn his back on Mercedes and his baby. As Mercedes headed to the abortion clinic, Joe and Freddie raced after her, and Joe was relieved to discover Mercedes didn't go through with the abortion and promised to stand by her. In August 2015, Mercedes and Joe discovered they were expecting a baby boy. In October 2015, Mercedes and Joe realised they had feelings for each other and began a relationship.
In November 2015, following an argument with Joe, Mercedes met up with Lockie Campbell, whom she kissed. Upon discovering this, Joe broke up with Mercedes, so Mercedes spitefully lied to Joe that he wasn't the father of her baby. Afterwards, Joe went to Canada to visit his mum Sandy Roscoe. Mercedes later realised that she hadn't felt the baby move all day, and at the hospital, learned that her baby had died. Mercedes had labour induced the next day, giving birth to a stillborn baby who she named Gabriel. Gabriel's funeral was held eight days later on the 13th November. On the day of the funeral, Joe returned to the village and was informed by Robbie Roscoe and Holly Cunningham of Gabriel's death. After offering his condolences, Mercedes reconciled with Joe, but decided against telling him the truth about Gabriel's paternity. On New Year's Eve, Mercedes confessed to Joe that Gabriel was his son, leaving Joe angry that he never got to see his son or say goodbye. The next day, Mercedes took Joe to Gabriel's grave, where Joe forgave her, realising she only lied to stop him feeling the pain that she felt.
In July 2017, Mercedes saw a grown-up vision of Gabriel. Oblivious to his identity (or that she was imagining him), she spoke to him about her other son Bobby Costello, who resided in California with his grandfather. "Gabriel" convinced her to go be with him.
In May 2024, Mercedes was reminded of Gabriel when she learned that Joel and Leela Dexter's son Noah was stillborn. In July 2024, Mercedes gave birth to fraternal twin girls, naming one of them Maria-Gabriella as a tribute to Gabriel